Polyurethane foam

Abstract

A polyurethane or polyisocyanurate foam is derived from a mixture comprising a crude isocyanate component and a polyol component which contains all or some of the following products in a homogeneous mixture: polyols, catalysts, surfactants, water, flame-retardants, expanding agents, fillers, dyes and pigments, in which the expanding agents comprise a pentane component associated with a dialkanolamide derived from fatty or oily substances of vegetable origin.

I claim: 
     
       1. A method of making polyurethane foam, said method comprising mixing an isocyanate component and a polyol component, wherein said polyol component includes a pentane and a dialkanolamide derived from oily or fatty substances of vegetable origin, wherein said dialkanolamide is present in an amount of at least 5% by weight based on the weight of the polyol component, and wherein the solubility of the pentane in the polyol component is enhanced due to the presence of the dialkanolamide. 
     
     
       2. The method according to claim 1, wherein said dialkanolamide is incorporated in a weight ratio 1:1 to 1:2 with respect to said pentane. 
     
     
       3. The method according to claim 1, wherein said dialkanolamide is a diathanolamide. 
     
     
       4. The method according to claim 3, wherein said diethanolamide is a diethanolamide derived from soya oil. 
     
     
       5. The method according to claim 1, wherein said pentane is selected from the group consisting of n-pentane, iso-pentane, cyclopentane and mixtures thereof. 
     
     
       6. A method of making polyurethane foam, said method comprising mixing an isocyanate component and a polyol component, wherein said polyol component includes a pentane and a dialkanolamide derived from oily or fatty substances of vegetable origin, wherein said dialkanolamide is present in an amount of at least 5% by weight based on the weight of the polyol component and in a weight ratio of 1:1 to 1:2 with respect to said pentane, and wherein the solubility of the pentane in the polyol component is enhanced due to the presence of the dialkanolamide.